java.lang.NoClassDefFoundError: org/openqa/selenium/chrome/ChromeDriver

This error occurs when the ChromeDriver class is not found in the classpath. The most common cause of this error is a missing or incorrect Selenium WebDriver dependency.

To resolve this error, you can try the following steps:

1. Check that you have added the correct version of the Selenium WebDriver dependency in your project. You can download the latest version of the Selenium WebDriver from the official website.

2. Make sure that your project's classpath includes the Selenium WebDriver jar files.

3. Check that the ChromeDriver executable is available on the system path. You can download the ChromeDriver executable from the official website.

4. Ensure that you are using the correct version of the ChromeDriver that is compatible with the version of Chrome that you have installed.

5. If you are using a build tool such as Maven or Gradle, ensure that the Selenium WebDriver dependency is correctly configured in your build file.

6. Restart your IDE and rebuild your project.

If none of the above steps resolve the error, you may need to seek further assistance or consult the documentation of the tool or framework you are using.